#stuffing_nut__packing_nut__packingnut  a nut used to tighten a stuffing box
  supertype:  #nut.block  a small square or hexagonal metal block with internal screw thread to be fitted onto a bolt
  part of:  #stuffing_box__packing_box__packingbox  a small chamber in which packing is compressed around a reciprocating shaft or piston to form a seal

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